prep1-149 which指代

149.      (32963-!-item-!-188;#058&006488)

Until Berta and Ernst Scharrer established the concept of neurosecretion in 1928, scientists believed that either cells secreted hormones, which made them endocrine cells and thus part of the endocrine system, or conducted electrical impulses, in which case they were nerve cells and thus part of the nervous system.

(A) either cells secreted hormones, which made them

(B) either cells secreted hormones, making them

(C) either cells secreted hormones and were

(D) cells either secreted hormones, in which case they were

(E) cells either secreted hormones, which made them

请问D中的which指代谁啊？

E中which 指代错误，指hormones.

但我觉得这题出的不好，虽然可通过平行对称选Ｄ，但Ｄ里面的they 的指代就没有歧义了吗？　我觉得他可以指代cells, 也可以指代hormones。

大家觉得哪？

hormones 只能是被 endorcrine cell 分泌出来，hormones 本身不能制造 endorcrine cell. endorcrine cell 是人体众多细胞种类中的一种，功能是分泌 hormones.

排这个